package filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import pojo.User;



public class SecFilter implements Filter{

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req=(HttpServletRequest)request;
		HttpServletResponse resp=(HttpServletResponse)response;  //强转		
		HttpSession sen=req.getSession();
		User u=(User)sen.getAttribute("user");
		if (u!=null) {
			chain.doFilter(request, response);
		}else {
			resp.sendRedirect("login.jsp");
		}
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

}
